CN216489790U - Charging circuit with trickle bypass - Google Patents
Charging circuit with trickle bypass Download PDFInfo
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- CN216489790U CN216489790U CN202121663301.4U CN202121663301U CN216489790U CN 216489790 U CN216489790 U CN 216489790U CN 202121663301 U CN202121663301 U CN 202121663301U CN 216489790 U CN216489790 U CN 216489790U
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- 238000007600 charging Methods 0.000 title claims abstract description 21
- 230000003139 buffering effect Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 238000010281 constant-current constant-voltage charging Methods 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000010280 constant potential charging Methods 0.000 description 1
- 238000010277 constant-current charging Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/30—Reducing waste in manufacturing processes; Calculations of released waste quantities
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model relates to the technical field of charging, and aims to solve the technical problem that the battery cannot be charged when the voltage of the battery is lower than the threshold value of a charger. Therefore, the technical problem that the battery voltage is lower than the threshold value of the charger and cannot be charged is solved, and the loss of manpower, material resources and financial resources is reduced.
Description
Technical Field
The utility model relates to the technical field of charging, in particular to a charging circuit with a trickle bypass.
Background
The existing lead-acid storage battery charger is charged in two or three stages, namely, a constant-current, constant-voltage and floating charge three-stage type can meet the charging requirement of most storage batteries. In the actual use process, the natural discharge of the storage battery caused by long-term storage of a plurality of batteries produced by manufacturers or over-discharge of the batteries in the use process is found to cause very low battery voltage.
Most current chargers only adopt a constant-current and constant-voltage charging mode, and the battery voltage is lower than the threshold value of the charger, so that the storage battery cannot be charged. The user takes the battery to a place where the battery is professionally repaired to repair or directly throws away the battery as waste, which brings loss of manpower, material resources and financial resources to our life.
SUMMERY OF THE UTILITY MODEL
The utility model provides a charging circuit with a trickle bypass, which aims to solve the technical problem that the battery voltage is lower than the threshold value of a charger and cannot be charged.
In order to achieve the purpose, the technical scheme of the utility model is realized as follows:
a charging circuit with a trickle bypass comprises a voltage regulator, a relay, a triode and a voltage comparator, wherein two pin ends of a coil in the relay are respectively connected with the positive electrode of an output power supply of a switching power supply and the positive electrode of the voltage regulator; an emitting electrode of the triode is grounded through a resistor R7, the emitting electrode of the triode is connected with an inverted input end of a voltage comparator, a base electrode of the triode is connected with an output end of the voltage comparator, and a non-inverting output end of the voltage comparator is provided with a first reference voltage; the cathode of the voltage regulator is grounded, and a reference pole of the voltage regulator is provided with a second reference voltage; the voltage regulator is used for regulating the anode voltage of the voltage regulator according to the second reference voltage, and when the voltage change of the anode of the voltage regulator exceeds a threshold value, the relay generates action and switches between trickle charging and constant-current constant-voltage charging modes; the voltage comparator is used for controlling the conduction state of the triode according to the first reference voltage and the emitter voltage of the triode. Therefore, the technical problem that the battery voltage is lower than the threshold value of the charger and cannot be charged is solved, and the loss of manpower, material resources and financial resources is reduced.
The voltage signal amplifying circuit further comprises a voltage follower used for amplifying, buffering, isolating and impedance matching of a voltage signal, wherein the output end of the voltage follower is connected with the inverting input end of the voltage comparator, and the inverting input end of the voltage comparator is connected with the emitting electrode of the triode.
Further, the voltage follower comprises a first operational amplifier, a non-inverting input terminal of the first operational amplifier is connected with an output terminal of the first operational amplifier, an inverting input terminal of the first operational amplifier is connected with an emitter of the triode through a resistor R5, and an output terminal of the first operational amplifier is connected with an inverting input terminal of the voltage comparator through a resistor R3.
Preferably, the first reference voltage generating circuit comprises resistors R1 and R2, a 1 st end of the resistor R2 is connected to the positive electrode of the output power supply, a 2 nd end of the resistor R2 is connected to the non-inverting input end of the voltage comparator, and a 2 nd end of the resistor R2 is connected to the ground through a resistor R1.
Preferably, the second reference voltage generating circuit comprises resistors R8 and R9, a 1 st end of the resistor R9 is used for being connected with the positive pole of the battery, a 2 nd end of the resistor R9 is connected with the reference pole of the voltage regulator, and a 2 nd end of the resistor R9 is grounded through a resistor R8.
Further, a diode D2 for preventing current from flowing backwards is arranged between the positive electrode of the output power supply and the positive electrode of the battery, the anode of the diode D2 is connected with the positive electrode of the output power supply, and the cathode of the diode D2 is connected with the positive electrode of the battery.
The beneficial effects brought by the implementation of the utility model are as follows:
when the battery voltage is too low, the second reference voltage is enabled to be generated, the voltage regulator regulates the anode voltage of the voltage regulator according to the second reference voltage, and when the voltage variation of the anode of the voltage regulator exceeds a threshold value, the relay is enabled to generate action and is switched into trickle charge; the voltage comparator controls the conduction state of the triode according to the first reference voltage and the emitter voltage of the triode, and maintains the dynamic balance of trickle charge. Therefore, the technical problem that the battery voltage is lower than the threshold value of the charger and cannot be charged is solved, and the loss of manpower, material resources and financial resources is reduced. In addition, the voltage follower is also included, and plays roles in amplifying, buffering, isolating and impedance matching of voltage signals. A diode D2 is arranged between the positive pole of the output power supply and the positive pole of the battery, and the effect of preventing the current from flowing backwards is achieved.
Drawings
Fig. 1 is a schematic diagram of a constant-current constant-voltage charging control circuit according to an embodiment of the present invention;
FIG. 2 is a block diagram of a trickle bypass charge control circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a trickle bypass charge control circuit according to an embodiment of the present invention.
In the figure: an output power supply positive electrode VCC; a battery positive electrode B +; battery negative electrode B-; negative pole B1-of the output power supply; a transistor Q1; an optical coupler Q2; a first operational amplifier U1; a second operational amplifier U2; a voltage regulator U3; a constant-current and constant-voltage control module U5; relay K1.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Referring to fig. 1, in the constant current and voltage control circuit provided by the present invention, a secondary output voltage of a transformer T1 from a switching power supply is rectified and stabilized by a diode D1 to obtain an output power supply anode VCC, and the output power supply anode VCC is output to a subsequent stage, and a 2 nd terminal of a constant current and voltage control module U5 collects a voltage of the output power supply anode VCC through R12 and R11, compares the voltage with a reference voltage of a constant current and voltage control module U5, and feeds back the voltage to a previous stage through an optocoupler Q2 to adjust the voltage to achieve a constant voltage state. A diode D2 for preventing current from flowing backwards is arranged between the output power supply anode VCC and the battery anode B +, the anode of the diode D2 is connected with the output power supply anode VCC, and the cathode of the diode D2 is connected with the battery anode B +.
The resistor R10 is used for current collection, feeding back to the 6 th end of the constant current and constant voltage control module U5, comparing the current with reference parameters, and feeding back to a preceding stage through the optocoupler Q2 to adjust the current to reach a constant current state.
The resistor R13 and the capacitor C2 are used for compensating voltage feedback, and the resistor R17 and the capacitor C3 are used for compensating current feedback.
When the battery voltage is too low, the switching power supply can protect the battery and cannot charge the battery, and trickle charging with small current is needed to solve the problem.
Referring to fig. 2 and 3, in order to realize trickle charging with a small current, a block diagram and a schematic diagram of a trickle bypass charging control circuit are provided, and the trickle bypass charging control circuit comprises a voltage regulator U3, a relay K1, a triode Q1 and a voltage comparator, wherein the relay K1 is respectively connected with the voltage regulator U3 and the triode Q1, and the triode Q1 is connected with the voltage comparator.
Two pin ends of a coil in the relay K1 are respectively connected with an output power supply anode VCC of the switching power supply and an anode of the voltage regulator U3, a common end of the relay K1 is used for being connected with a battery cathode B-, a normally open end of the relay K1 is connected with a collector C of the triode Q1, and a normally closed end of the relay K1 is connected with an output power supply cathode B1-;
an emitter E of the triode Q1 is grounded through a resistor R7, an emitter E of the triode Q1 is connected with an inverting input end of a voltage comparator, a base B of the triode Q1 is connected with an output end of the voltage comparator, and a non-inverting output end of the voltage comparator is provided with a first reference voltage;
the cathode of the voltage regulator U3 is grounded, and the reference pole of the voltage regulator U3 is provided with a second reference voltage;
the voltage regulator U3 is used for adjusting the voltage of the output power supply positive pole VCC of switching power supply, and relay K1 is used for selecting constant current constant voltage charging or trickle charge mode, and triode Q1 is used for adjusting the trickle current size, and the voltage comparator maintains the dynamic balance of trickle charge through the voltage of comparison triode Q1 emitter and first reference voltage.
The 1 st end and the 2 nd end of relay K1 are the pin of its inner coil, relay K1's 3 rd end is the common port, relay K1's 4 th end is the end that normally closes, relay K1's 5 th end is the end that normally opens, the 1 st end is connected with switching power supply's output power supply positive pole VCC, the 2 nd end is connected with voltage regulator U3, the 3 rd end is connected with battery negative pole B-, the 4 th end is connected with switching power supply's output power supply negative pole B1-, the 5 th end is connected with triode Q1's collecting electrode C, triode Q1's projecting pole E passes through resistance R7 ground connection.
In one embodiment of the utility model, the voltage regulator U3 is a three-terminal sampling integrated circuit, for example model TL 431.
Voltage regulator U3 is used for adjusting output voltage, and voltage regulator U3's the 1 st end is the reference pole, and the 2 nd end is the positive pole, and the 3 rd end is the negative pole, and 3 rd end ground connection, the 2 nd end is connected with relay K1's coil pin, and the 1 st end connection is provided with the second reference voltage.
The generation circuit of the second reference voltage is a battery voltage sampling circuit and comprises resistors R8 and R9 which are connected in series, wherein the 1 st end of the resistor R9 is connected with the battery anode B +, the 2 nd end of the resistor R9 is connected with the 2 nd end of the resistor R8, the 1 st end of the resistor R8 is grounded, and the 2 nd end of the resistor R9 is connected with the 1 st end of the voltage regulator U3.
The voltage regulator U3 is used for regulating the anode voltage of the voltage regulator U3 according to a second reference voltage, and when the voltage change of the anode of the voltage regulator U3 exceeds a threshold value, the relay K1 is enabled to act and switch between a trickle charge mode and a constant-current constant-voltage charge mode; the voltage comparator is used for controlling the conducting state of the transistor Q1 according to the first reference voltage and the voltage of the emitter E of the transistor Q1.
The voltage comparator comprises a second operational amplifier U2, a non-inverting input end of the voltage comparator is provided with a first reference voltage, a generating circuit of the first reference voltage comprises a resistor R1 and a resistor R2, a 1 st end of the resistor R2 is connected with an output power supply anode VCC, a 2 nd end of the resistor R2 is connected with the non-inverting input end of the voltage comparator, and a 2 nd end of the resistor R2 is grounded through the resistor R1.
The inverting input end of the voltage comparator is connected with the emitter E of the triode Q1, the output end of the voltage comparator is connected with the base electrode of the triode Q1, when the current of the emitter E of the triode Q1 is increased, the voltage obtained by the inverting input end of the voltage comparator is increased, and when the inverting input end of the voltage comparator is higher than the voltage of the non-inverting input end of the voltage comparator, the voltage comparator outputs low level, so that the output of the triode Q1 is reduced, therefore, the dynamic balance is maintained, and the trickle charge is realized.
And a voltage follower is also connected between the inverting input end of the voltage comparator and the emitter E of the triode Q1, the voltage follower is mainly used for voltage amplification, the load carrying capacity is improved, the waveform and amplitude of a signal are ensured to be unchanged, and the voltage follower also plays roles in buffering, isolation and impedance matching.
Specifically, the voltage follower comprises a first operational amplifier U1, an inverting input terminal of the first operational amplifier U1 is connected with an emitter of a triode Q1 through a resistor R5, a non-inverting input terminal of the first operational amplifier U1 is connected with an output terminal thereof through a resistor R4, and the output terminal is connected with an inverting input terminal of the voltage comparator through a resistor R3.
The working principle is as follows:
when the voltage of the battery is normal, namely the voltage of the battery is within the range required by the constant current and the constant voltage, the voltage is divided by the resistors R9 and R8 and then compared with the reference voltage 2.5V of the voltage regulator U3, and then the relay K1 is switched to the constant current and the constant voltage for charging. The common terminal 3 of the relay is connected with the normally closed terminal 4, and the battery is charged in a constant current and constant voltage mode.
When the battery voltage is too low, relay K1 switches to trickle charge. The resistor R7 is used for collecting current, feeding the current back to the first operational amplifier U1 for amplification, and comparing the current with the second operational amplifier U2 to control the triode Q1 to control the current. The 2 nd terminal voltage of the voltage regulator U3 becomes low, the relay K1 is operated, the common terminal 3 is connected to the normally open terminal 5, and the battery is charged in a trickle mode.
The beneficial effects brought by the implementation of the utility model are as follows:
when the battery voltage is too low, the second reference voltage is enabled to be generated, the voltage regulator regulates the anode voltage of the voltage regulator according to the second reference voltage, and when the voltage variation of the anode of the voltage regulator exceeds a threshold value, the relay is enabled to generate action and is switched into trickle charge; the voltage comparator controls the conduction state of the triode according to the first reference voltage and the emitter voltage of the triode, and maintains the dynamic balance of trickle charge. Therefore, the technical problem that the battery voltage is lower than the threshold value of the charger and cannot be charged is solved, and the loss of manpower, material resources and financial resources is reduced. In addition, the voltage follower is also included, and plays roles in amplifying, buffering, isolating and impedance matching of voltage signals. A diode D2 is arranged between the positive pole of the output power supply and the positive pole of the battery, and the effect of preventing the current from flowing backwards is achieved. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A charging circuit with a trickle bypass is characterized by comprising a voltage regulator, a relay, a triode and a voltage comparator;
two pin ends of a coil in the relay are respectively connected with the anode of an output power supply of the switching power supply and the anode of the voltage regulator, the common end of the relay is used for being connected with the cathode of a battery, the normally open end of the relay is connected with the collector of the triode, and the normally closed end of the relay is connected with the cathode of the output power supply of the switching power supply;
an emitting electrode of the triode is grounded through a resistor R7, the emitting electrode of the triode is connected with an inverted input end of a voltage comparator, a base electrode of the triode is connected with an output end of the voltage comparator, and a non-inverting output end of the voltage comparator is provided with a first reference voltage;
the cathode of the voltage regulator is grounded, and a reference pole of the voltage regulator is provided with a second reference voltage;
the voltage regulator is used for regulating the anode voltage of the voltage regulator according to the second reference voltage, and when the voltage change of the anode of the voltage regulator exceeds a threshold value, the relay generates action and switches between trickle charging and constant-current constant-voltage charging modes; the voltage comparator is used for controlling the conduction state of the triode according to the first reference voltage and the emitter voltage of the triode.
2. The trickle-bypass charging circuit according to claim 1, further comprising a voltage follower for voltage signal amplification, buffering, isolation and impedance matching, wherein an output terminal of the voltage follower is connected to an inverting input terminal of a voltage comparator, and wherein the inverting input terminal of the voltage comparator is connected to an emitter of the transistor.
3. The trickle-bypass charging circuit according to claim 2, wherein the voltage follower comprises a first operational amplifier, a non-inverting input of the first operational amplifier is connected to an output thereof, an inverting input of the first operational amplifier is connected to an emitter of the transistor through a resistor R5, and an output of the first operational amplifier is connected to an inverting input of the voltage comparator through a resistor R3.
4. The charging circuit with trickle bypass according to claim 1, wherein the generating circuit of the first reference voltage comprises resistors R1 and R2, the 1 st terminal of the resistor R2 is connected to the positive electrode of the output power source, the 2 nd terminal of the resistor R2 is connected to the non-inverting input terminal of the voltage comparator, and the 2 nd terminal of the resistor R2 is grounded through a resistor R1.
5. The charging circuit with trickle bypass according to claim 1, wherein the generating circuit of the second reference voltage comprises resistors R8 and R9, the 1 st terminal of the resistor R9 is used for connecting with the positive electrode of the battery, the 2 nd terminal of the resistor R9 is connected with the reference electrode of the voltage regulator, and the 2 nd terminal of the resistor R9 is grounded through a resistor R8.
6. A charging circuit with trickle bypass according to any one of claims 1 to 5, wherein a diode D2 for preventing current from flowing backward is arranged between the positive pole of the output power supply and the positive pole of the battery, the anode of the diode D2 is connected with the positive pole of the output power supply, and the cathode of the diode D2 is connected with the positive pole of the battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121663301.4U CN216489790U (en) | 2021-07-21 | 2021-07-21 | Charging circuit with trickle bypass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121663301.4U CN216489790U (en) | 2021-07-21 | 2021-07-21 | Charging circuit with trickle bypass |
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| Publication Number | Publication Date |
|---|---|
| CN216489790U true CN216489790U (en) | 2022-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121663301.4U Active CN216489790U (en) | 2021-07-21 | 2021-07-21 | Charging circuit with trickle bypass |
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|---|---|
| CN (1) | CN216489790U (en) |
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2021
- 2021-07-21 CN CN202121663301.4U patent/CN216489790U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A charging circuit with a trickle bypass Granted publication date: 20220510 Pledgee: Agricultural Bank of China Limited Xiamen Lianqian Branch Pledgor: XIAMEN ZHONGXIN ELECTRICAL EQUIPMENT Co.,Ltd. Registration number: Y2024980003775 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |